1. FULL BACK PM, RPL AND 308 FIELD IF PHONE IS NOT DEAD.2. ERASE FLASH WITH 8MB FILE BY SELECTING IT AS MCU.3. FLASH WITH LATEST VERSION. DONT AFFRAID ABOUT THE ISSUE OF 4GB OR 8GB BUT TYPE MUST BE SAME. MEANS RM-43 4GB, RM-43 8GB.4. NOW PHONE MUST ON AND U GET MSG PHONE START UP FAIL5. GO TO CRT TOOL . WRITE RPL U BACK UP.6. USE SX4 FUNCTION WRITE 308 FIELD7. WRITE FULL PM WITH SX4 FROM 0 TO 512 EXCEPT 3088. EVERY THING OK EXCEPT PHONE IMEI. IT WILL 1239. NOW DOWNGRADE U R PHONE 10. DOWGRADE THIS WAYCLICK ON DOWNRADESELECT MANNUAL FLASHUSE INICLICK ON FULL FACTORYFLASH11. ENJOY. SAY THANKS.